Calculator



FIG. 1 is a perspective view of a calculator showing my new design.

FIG. 2 is a front view thereof, shown at a reduced scale;

FIG. 3 is a rear view thereof

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

I claim the ornamental design for a calculator, as shown and described. 